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This guide from Mytour explains how to open and execute executable JAR files on both Windows and Mac computers. JAR (Java Archive) files contain data intended for use with Java programs. Typically, JAR files serve as containers for data required by another program to operate with Java. Consequently, attempting to open these files by double-clicking them will yield no results. Similarly, most executable JAR files are distributed as installation files for installing applications or programs. Therefore, it's essential to double-check that you have the correct JAR file designed for your operating system if you encounter difficulties opening it.
Steps
For Windows Users
Install Java on your computer if it's not already installed. Running JAR files requires Java to be installed on your computer. If Java isn't already installed, visit Java's website at https://www.java.com/en/download/, and beneath the latest version of Java, click the Free Java Download button, then proceed to install Java once it's downloaded.
- You may need to restart your computer for Java to be fully integrated.
Execute the JAR file by double-clicking it. If the file is executable and you have Java installed, it should open. If it doesn't, proceed to the next step.
- You might encounter a pop-up window asking which program you want to use to open the file. If prompted, select Java(TM) and then click OK.
Verify that your JAR file is an executable file. JAR files downloaded for program installations differ from 'library' JAR files, which store data for programs running Java. Non-executable JAR files lack interfaces like executable ones, preventing them from being run.
- For instance, many JAR files within a program's data directories aren't executable.
- If you obtained your JAR file online, ensure you chose the Windows version rather than the Mac version.
Update your Java installation.
Double-click your JAR file once more. If it still doesn't open, the file may not be executable and cannot be launched in the usual manner.
For Mac Users
Install Java on your Mac if it's not already installed. JAR files require Java to run. If Java isn't installed, visit the Java website at https://www.java.com/en/download/, click Download below the latest version, and follow the installation instructions.
- When installing a non-Apple file on Mac, you may need to click OK on a warning, access System Preferences from the Apple menu, select Security & Privacy, unlock the menu, click Open Anyway next to the file's name, and then click Open when prompted.
Attempt to double-click your JAR file. If it's executable and Java is installed, it should launch. If not, proceed to the next step.
Ensure your JAR file is an executable. Unlike 'library' JAR files used for Java programs, executable JAR files have interfaces and can be run directly. Non-executable JAR files lack this functionality and cannot be launched.
- For instance, many JAR files in program data folders aren't executable.
- If you downloaded a JAR file online, ensure it's for Mac and not another OS.
Update Java software on your system.Access the Apple menu.
Attempt to double-click your JAR file once more. If it still doesn't open, it likely lacks executable properties and cannot be run conventionally.
Helpful Tips
- Java programs are expected to function across all platforms. If one doesn't, it might be due to poor coding or its reliance on specific system resources or programs.
- A .jar file might serve as either a program or a library. If it's a library, it lacks an executable class and therefore cannot be executed.
Important Notices
- While Java is generally considered safer than many other programming languages, it's worth noting that Java-based malware does exist. Exercise caution when running JAR files obtained from the internet.
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